CN212032488U

CN212032488U - Physical free fall experiment demonstration device

Info

Publication number: CN212032488U
Application number: CN201820961795.6U
Authority: CN
Inventors: 刘一骁
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-06-21
Filing date: 2018-06-21
Publication date: 2020-11-27
Anticipated expiration: 2028-06-21

Abstract

The utility model belongs to the technical field of the physics experiments and specifically relates to a physics free fall experiment presentation device, including base, bracing piece, baffle, photoelectric sensor, time-recorder A, time-recorder B, experiment section of thick bamboo, air extractor, experiment ball, the base middle part is equipped with the air extractor, is equipped with time-recorder A and time-recorder B on the base of air extractor both sides respectively, baffle both sides symmetry is fixed with the experiment section of thick bamboo, and the fixed photoelectric sensor who aims at the experiment section of thick bamboo that is equipped with in sliding sleeve's inboard, the upper end spiro union of experiment section of thick bamboo is fixed with the top stopper, inlays on the bottom surface of top stopper and has the electro-magnet. The utility model has the advantages of reasonable design, can carry out accurate timing and data calculation to the experiment ball free fall experiment, can carry out the experiment ball free fall experiment under the vacuum situation with weight or different weight, also can carry out the experiment ball with weight and verify with the contrast experiment of the same distance of free fall under the air and the vacuum respectively, easy operation is convenient, and is vivid directly perceived, has improved the teaching effect.

Description

Physical free fall experiment demonstration device

Technical Field

The utility model belongs to the technical field of the physics experiment apparatus and specifically relates to a physics free fall experiment presentation device.

Background

The conventional object moves with zero initial velocity only under the action of gravity, and the conventional object is called free-fall motion. Free fall motion is a physical model in an ideal situation. The characteristic of free falling body movement is reflected on a free character, and the meaning is as follows: (1) the object starts to fall with a static initial velocity V =0, and if the initial velocity of the object is not 0, the object cannot be regarded as a free-falling object even if it falls vertically. (2) In the falling process of the object, except the action of gravity, the object is not subjected to any other external acting force (including air resistance) or the resultant force of external force is 0. (3) When any object does free-fall motion at the same height, the falling time is the same. However, in general, falling bodies are influenced by air resistance in the air, and the resistance of the air to the falling bodies is gradually increased along with the increase of the moving speed of the free falling bodies. The existing physical class free falling body experiment device can only simply demonstrate the motion state of the free falling body, has single function, can not carry out accurate data calculation, comparison and verification, does not eliminate the influence of air resistance, and has poor demonstration effect.

Disclosure of Invention

The utility model aims at overcoming the technical shortcoming and providing a physical free fall experiment demonstration device. The experimental ball free-falling body experiment device can perform accurate timing and data calculation on the experimental ball free-falling body experiment, can perform the free-falling body experiment of the experimental ball with the same weight or different weights under a vacuum condition, can also perform contrast experiment verification of the experimental ball with the same weight respectively in the air and at the same distance of the free-falling body under the vacuum condition, and is simple and convenient to operate, visual.

The utility model provides a technical scheme that technical problem adopted does: the utility model provides a physics free fall experiment presentation device, includes base, bracing piece, baffle, photoelectric sensor, time-recorder A, time-recorder B, experiment section of thick bamboo, air extractor, experiment ball, its characterized in that: the device comprises a base, wherein 2 support rods perpendicular to the base are symmetrically arranged on two sides of the base, scale marks are arranged on the support rods, an air extractor is arranged in the middle of the base, a timer A and a timer B are respectively arranged on the bases on two sides of the air extractor, the upper side of the air extractor is communicated with a T-shaped air extraction pipe, valves are respectively arranged on branch pipes on two sides of the T-shaped air extraction pipe, experimental cylinders are symmetrically fixed on two sides of a baffle plate, the experimental cylinders are made of transparent plastics, connecting rods are fixedly arranged at the upper end and the lower end of the outer side of the experimental cylinders, fixing sleeves are fixedly arranged at the end parts of the connecting rods and sleeved on the support rods, 2 sliding sleeves are sleeved on the support rods between the upper fixing sleeves and the lower fixing sleeves, photoelectric sensors aligned with the experimental cylinders are fixedly arranged on the inner sides of the sliding sleeves, fixing bolts are respectively arranged on the outer sides, the utility model discloses a three-phase experiment device, including an experiment tube, two top plugs, a bottom plug, a buffer slot, a T-shaped guide pipe, a tube cover, a photoelectric sensor, a control switch, an air duct, a gas exhaust pipe, a photoelectric sensor and a control switch. When the device is used, the buffer tank and the buffer mesh bag can buffer falling experimental balls, valves on branch pipes at two sides of the T-shaped exhaust pipe are opened, air in the experimental cylinder can be pumped out through the air pump, so that the air resistance influence of the falling experimental balls can be conveniently eliminated, the control switch can control electromagnets on the two top plugs to be powered off simultaneously, the experimental balls at two sides fall simultaneously, the timer A and the timer B are respectively in signal connection with photoelectric sensors at the left side and the right side and can be used for timing the falling of the experimental balls at two sides, the photoelectric sensors at the upper side are aligned to the experimental balls, the photoelectric sensors at the lower side are fixed on the same scale line, when the experimental balls pass through the photoelectric sensors at the upper side, the corresponding timer A or the timer B starts to time, when the experimental balls pass through the photoelectric sensors at the lower side, the timing is finished, the falling time of the distance between the upper photoelectric sensors and the, can carry out the comparison of free fall data calculation and verify, during the experiment, can adsorb a solid hollow experiment ball of same weight or different weight in the both sides experiment section of thick bamboo, then evacuate the both sides experiment section of thick bamboo air, carry out the experiment ball free fall experiment under the vacuum situation, then contrast the time of both sides experiment ball whereabouts, can open the tube cap on the T shape pipe of one side, be full of air in the experiment section of thick bamboo that makes one side, vacuum in the experiment section of thick bamboo of opposite side, the hollow experiment ball of reuse equal weight carries out the free fall experiment, the whereabouts time of comparable both sides experiment ball.

The utility model discloses the beneficial effect who has is: the utility model has the advantages of reasonable design, can carry out accurate timing and data calculation to the experiment ball free fall experiment, can carry out the experiment ball free fall experiment under the vacuum situation with weight or different weight, also can carry out the experiment ball with weight and verify with the contrast experiment of the same distance of free fall under the air and the vacuum respectively, easy operation is convenient, and is vivid directly perceived, has improved the teaching effect.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The present invention will be described in detail with reference to fig. 1.

As shown in fig. 1, the utility model discloses a base 1, bracing piece 2, baffle 17, photoelectric sensor 14, time-recorder A25, time-recorder B24, laboratory cylinder 16, air extractor 3, experiment ball 21, its characterized in that: the device comprises a base 1, a base 1 and a baffle 17, wherein two sides of the base 1 are symmetrically provided with 2 support rods 2 perpendicular to the support rods, the support rods 2 are provided with scale marks 23, the middle part of the base 1 is provided with an air pump 3, the base 1 at two sides of the air pump 3 is respectively provided with a timer A25 and a timer B24, the upper side of the air pump 3 is communicated with a T-shaped air exhaust pipe 4, branch pipes at two sides of the T-shaped air exhaust pipe 4 are respectively provided with a valve 5, two sides of the baffle 17 are symmetrically fixed with an experimental cylinder 16, the experimental cylinder 16 is made of transparent plastic, the upper end and the lower end of the outer side of the experimental cylinder 16 are fixedly provided with a connecting rod 16, the end part of the connecting rod 16 is fixedly provided with a fixed sleeve 15 which is sleeved on the support rod 2, the support rod 2 between the upper fixed sleeve 15 and the lower fixed sleeve is sleeved with 2 sliding sleeves 12, the inner side of the sliding sleeve, inlay on the bottom surface of top stopper 18 and have electro-magnet 19, electro-magnet 19 downside adsorbs there is experimental ball 21, link to each other with control switch 20 and external power supply electrical property through wire 22 between the electro-magnet 19 in two top stoppers 18, the lower extreme spiro union of experiment section of thick bamboo 16 is fixed with end stopper 9, is equipped with dashpot 10 on the top surface of end stopper 9, and dashpot 10 upside is equipped with buffering pocket 11, is equipped with T shape pipe 7 on the bottom surface of end stopper 9, and one side branch pipe tip of T shape pipe 7 is equipped with tube cap 8, and the downside branch pipe of the T shape pipe 7 on the stopper 9 is linked together through air duct 6 and the both sides branch pipe of T shape exhaust tube 4 respectively at the bottom of both sides, photoelectric sensor 14 on the left and right sides bracing piece 2 is linked together with the time-recorder A25 and the time. When the device is used, the buffer tank 10 and the buffer mesh bag 11 can buffer a falling experimental ball 21, the valves 5 on the branch pipes at two sides of the T-shaped exhaust pipe 4 are opened, air in the experimental cylinder 16 can be exhausted through the air extractor 3, so that the influence of air resistance when the experimental ball 21 falls is conveniently eliminated, the control switch 20 can control the electromagnets 19 on the two top plugs 18 to be powered off simultaneously, the experimental balls 21 at two sides fall simultaneously, the timer A25 and the timer B24 are respectively in signal connection with the photoelectric sensors 14 at the left side and the right side, the control switch can be used for timing the falling of the experimental balls 21 at two sides, the photoelectric sensors 14 at the upper side are aligned with the experimental ball 21, the photoelectric sensors 14 at the lower side are fixed on the same scale line 23, when the experimental ball 21 passes through the photoelectric sensors 14 at the upper side, the corresponding timer A25 or the timer B24 starts timing, when the experimental ball 21 passes through the photoelectric sensors, the timing is over, can know the whereabouts time through the distance between upper and lower photoelectric sensor 14, can carry out the free fall data calculation contrast verification, during the experiment, can be with adsorbing a solid one hollow experiment ball 21 of same weight or different weight in the experiment section of thick bamboo 16 of both sides, then evacuate the air in the experiment section of thick bamboo 16 of both sides, experiment ball 21 free fall experiment under the vacuum condition carries out, then compare the time of both sides experiment ball 21 whereabouts, can open tube cap 8 on one side T shape pipe 7, make the experiment section of thick bamboo 16 of one side fill with air, the experiment section of thick bamboo 16 of the other side is interior vacuum, use the hollow experiment ball 21 of equal weight to carry out the free fall experiment again, the whereabouts time of both sides experiment ball 21 can be compared.

Claims

1. The utility model provides a physics free fall experiment presentation device, includes base, bracing piece, baffle, photoelectric sensor, time-recorder A, time-recorder B, experiment section of thick bamboo, air extractor, experiment ball, its characterized in that: the device comprises a base, wherein 2 support rods perpendicular to the base are symmetrically arranged on two sides of the base, scale marks are arranged on the support rods, an air extractor is arranged in the middle of the base, a timer A and a timer B are respectively arranged on the bases on two sides of the air extractor, the upper side of the air extractor is communicated with a T-shaped air extraction pipe, valves are respectively arranged on branch pipes on two sides of the T-shaped air extraction pipe, experimental cylinders are symmetrically fixed on two sides of a baffle plate, the experimental cylinders are made of transparent plastics, connecting rods are fixedly arranged at the upper end and the lower end of the outer side of the experimental cylinders, fixing sleeves are fixedly arranged at the end parts of the connecting rods and sleeved on the support rods, 2 sliding sleeves are sleeved on the support rods between the upper fixing sleeves and the lower fixing sleeves, photoelectric sensors aligned with the experimental cylinders are fixedly arranged on the inner sides of the sliding sleeves, fixing bolts are respectively arranged on the outer sides, the utility model discloses a three-phase experiment tube, including two top plugs, a bottom plug, a buffer slot, a T-shaped guide pipe, a tube cover, a photoelectric sensor, a control switch, an air duct, a suction tube, a gas tube, a T-shaped exhaust tube, a photoelectric sensor, a timer A and a timer B electric connection.